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1. Dr APJ Abdul Kalam UIT Jhabua
Topic :- Data Types & Variables
Submitted by:
Prof. Shray Saxena sir
Submitted to:
Hemendra parmar

2. What is data types and variable
 Data Types:
Data types specify the kind of data a variable can store, such as
numbers, characters, or boolean values. They help the compiler
allocate memory and define valid operations on data.
 Variables:
A variable is a named memory location used to store data values
that can change during program execution. It acts as a container
for data used in a program.

3. Data Types in C++
Basic Data
types
Derived
Data types
User Defined
Data types
int
char
float
double
bool
void
array
pointer
function
class
structure
union
using

4.  int – stores whole numbers (0 to 9)
e.g. :- int a = 10;
 char – stores a single character ( A to Z )
e.g. :- char name= ‘Hemendra’ ;
 float – stores decimal numbers (single precision)
e.g. :- float c = 3.5;
 Double – stores decimal numbers with high precision
e.g. :- double d = 45.678;
 bool – stores true or false
e.g. :- bool e = true;
 void – represents no value
e.g. :- void show() { }

5. Array: Stores multiple values of the same data type in a
single variable.
e.g.:- int a[3] = {1, 2, 3};
Pointer: Stores the memory address of another variable.
e.g.:- int x = 10; int *p = &x;
Function: A block of code that performs a specific task and
can be reused.
e.g.:- int add(int a, int b){ return a+b; }

6.  Class: A blueprint used to create objects, containing data members
and member functions. It supports data hiding and encapsulation.
e.g.:- class A{ int x; };
 Structure: A user-defined data type that groups different data
types together. All members are public by default.
e.g.:- struct S{ int a; char b; };
 Union: A user-defined data type where all members share the same
memory location. Only one member can hold a value at a time.
e.g.:- union U{ int x; float y; };
 using: Used to bring a namespace or define a type alias in C++.
It helps reduce code length and improve readability.
e.g.:- using namespace std;

7. Data Type Conversion
Data type conversion in C++ means changing one data type
into another automatically or manually for correct
calculations and results
Types of Data Type Conversion
 Implicit Type Conversion:
• Done automatically by the compiler.
• Converts smaller data type into larger data type.
 Explicit Type Conversion:
• Done manually by the programmer.
• Converts larger data type into smaller data type.

8. Implicit Type Conversion program
#include<iostream> using
namespace std; int main()
{
int x = 10; // integer x
char y = 'a'; // character c
// y implicitly converted to int.
// ASCII value of 'a' is 97 x = x+y;
// x is implicitly converted to float
float z = x + 1.1;
cout << "x = " << x << endl
<< "y = " << y << endl
<< "z = " << z << endl;
return 0;
}
x = 107
y = a
z = 108.1
Output:

9. explicit Type Conversion program
Sum = 2
Output:
// explicit type casting
#include<iostream> using
namespace std;
int main()
{
double x = 1.2;
// Explicit conversion from double to int
int sum = (int)x + 1;
cout << "Sum = " << sum;
return 0;
}

10. Thanks you